CNC Machining Calculators

Free CNC machining calculators for spindle speed, feed rate, feed per tooth, cutting speed, material removal rate (MRR), and drilling parameters. These tools are designed to support CNC machining, process development, and manufacturing engineering.

Spindle Speed

Formula n = (1000 × Vc) / (π × D)

n = Spindle Speed (RPM)

Vc = Cutting Speed (m/min)

D = Diameter (mm)

mm
m/min
Spindle Speed: ---

Feed Rate

Formula F = fz × z × n

F = Feed Rate (mm/min)

fz = Feed per Tooth (mm/tooth)

z = Number of Teeth

n = Spindle Speed (RPM)

mm/tooth
RPM
Feed Rate: ---

Feed per Tooth

Formula fz = F / (z × n)

fz = Feed per Tooth (mm/tooth)

F = Feed Rate (mm/min)

z = Number of Teeth

n = Spindle Speed (RPM)

mm/min
RPM
Feed per Tooth: ---

Cutting Speed

Formula Vc = (π × D × n) / 1000

Vc = Cutting Speed (m/min)

D = Diameter (mm)

n = Spindle Speed (RPM)

mm
RPM
Cutting Speed: ---

Material Removal Rate

Formula MRR = ap × ae × F

MRR = Material Removal Rate (mm³/min)

ap = Depth of Cut (mm)

ae = Width of Cut (mm)

F = Feed Rate (mm/min)

mm
mm
mm/min
Material Removal Rate: ---

Drilling Parameters

Spindle Speed Formula n = (1000 × Vc) / (π × D)

n = Spindle Speed (RPM)

Vc = Cutting Speed (m/min)

D = Drill Diameter (mm)

Feed Rate Formula F = fn × n

F = Feed Rate (mm/min)

fn = Feed per Revolution (mm/rev)

n = Spindle Speed (RPM)

mm
m/min
mm/rev
Spindle Speed: ---
Feed Rate: ---